it wouldn't be up to you since the Producer would've already made the character sure they might allow you a little leeway with how you act as the character but not much.

if you wanted to be on the show then you would audition like any normal person and if you get a part then you have to take whatever part they offer you otherwise you'll be seen as a selfish fan who only wants it his way or no way. The show isn't Burger King you can't have it your way.